Life Science #1
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Life Science #3
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Life Science #8
100
Planaria are flatworms that reproduce asexually. Catfish reproduce sexually. Which statement best compares planaria and catfish?
A. Planaria have offspring that are genetically different, and catfish have offspring that are identical.
B. Planaria require less time to produce offspring, and catfish require more time to produce offspring.
C. Planaria produce offspring one at a time, and catfish produce large numbers of offspring at one time.
D. Planaria require large amounts of energy to produce offspring and catfish require little energy to produce offspring.
B. Planaria require less time to produce offspring, and catfish require more time to produce offspring.
100
Circle one set of words in each pair of parentheses to construct an explanation about the transfer of genetic information during meiosis.
During meiosis, a parent cell first replicates its genetic information and then exchanges sections of DNA before dividing ( one time / two times ), producing ( two haploid / four haploid / four diploid ) daughter cells that are genetically ( similar to / different than ) the parent cell.
- two times
- four haploid
- different than
100
Circle a word or phrase in each set of options to correctly describe the process of meiosis.
A single cell divides ( once / twice ) to produce ( two / four / eight ) cells that contain ( the same / half the ) number of chromosomes as the original cell.
- twice
- four
- half the
100
While studying about reproduction in organisms, a student made the following list.
Title?
• produces genetic diversity
• allows for disease resistance
• offers a chance to reduce or remove undesirable traits from a species
Which title for the list is most accurate?
A. Advantages of Sexual Reproduction
B. Advantages of Asexual Reproduction
C. Disadvantages of Sexual Reproduction
D. Disadvantages of Asexual Reproduction
A. Advantages of Sexual Reproduction
100
Gregor Mendel investigated the genetics of pea plants in the 1850s. He knew that the offspring of some plants always produce offspring of the same color. He crossed purebred white-flowering pea plants with purebred purple-flowering pea plants to produce generation 1. Then, he crossed two of the generation 1 offspring to produce generation 2. The table shows the results of these crosses.
Mendel’s work provided science with the basics of genetics. Which statement best describes the genetic material in the nucleus of pea plant cells?
A. Genes are made of chromosome pairs held together by DNA strands.
B. Genes are clusters of proteins that make up the DNA on chromosomes.
C. Paired DNA strands are held together by chromosomes that are stored inside genes.
D. Chromosomes are made of tightly coiled DNA strands that have smaller sections called genes.
D. Chromosomes are made of tightly coiled DNA strands that have smaller sections called genes.
100
In the years following some major extinction events, surviving marine organisms had to live in warmer water. Warmer water contains less dissolved oxygen than colder water. How did this environmental change most likely affect marine organisms?
A. Individual organisms tended to decrease in size.
B. Each organism spent less time searching for food.
C. Organisms spent more time actively exploring their environment.
D. Organisms altered their habitat to be closer to the surface of the water.
A. Individual organisms tended to decrease in size.
200
Which diagram best represents a phase of mitosis that ensures the resulting cells contain identical genetic information?
200
The models represent two reproduction processes.
Select the three terms listed that describe only Model 1.
A. mitosis
B. meiosis
C. sexual reproduction
D. asexual reproduction
E. offspring different from parent
F. offspring the same as parent
B. meiosis
C. sexual reproduction
E. offspring different from parent
200
A student researching Gregor Mendel recorded the following notes about the scientist.
Which statement best explains a concept of heredity that is supported by Mendel’s findings?
A. The environment in which plants are grown affects their appearance.
B. Recessive traits are more likely to be expressed than dominant traits.
C. The appearance of certain traits is predictable and is controlled by genes.
D. Crossing pea plants in the wild produces results without observable patterns.
C. The appearance of certain traits is predictable and is controlled by genes.
200
An amoeba is a unicellular organism that moves through its water habitat by stretching its body surface. The diagram below shows binary fission in an amoeba.
Circle a word or phrase in each set of options to describe this process.
Binary fission is a type of ( asexual / sexual ) reproduction similar to ( meiosis / mitosis ) and results in two daughter cells that are ( identical to / different from ) the parent cell.
- asexual
- mitosis
- identical to
300
The graph shows how two fish species tolerate different oxygen levels in water
Which argument about fish survival is best supported by the evidence shown in the graph?
A. The blacktail shiner can survive any oxygen level in its environment.
B. The blackstripe topminnow can survive any oxygen level n its environment.
C. The blackstripe topminnow is better able to survive a wide range of oxygen levels in its environment than the blacktail shiner.
D. The blacktail shiner is better able to survive a wide range of oxygen levels in its environment than the blackstripe topminnow.
C. The blackstripe topminnow is better able to survive a wide range of oxygen levels in its environment than the blacktail shiner.
300
The model represents the basic components of genetics.
Organize the concepts that are shown by each letter in this model by recording the letters in the correct position.
1:________________________________________
2:________________________________________
3:________________________________________
1. B Chromosomes are located in the nucleus
2. C Chromosomes are composed of DNA molecules
3. A A DNA segment has protein synthesis instructions
400
In rock pocket mice, fur color is mostly controlled by a single gene. In these mice, dark fur (D)is dominant to light fur (d). The Punnett square shows a cross between a rock pocket mouse with dark-colored fur and a rock pocket mouse with light-colored fur.
Part A: In the Punnett square below, write a checkmark in the cell or cells that represent offspring that would be homozygous for light-colored fur.
Part B: Write the percentage of rock pocket mice offspring with light-colored fur represented by this cross on the line.
Percentage of rock pocket mouse offspring with light-colored fur: __________%
Part A: 
Part B: 50 %
500
Part A: Circle a word or phrase in each set of parentheses to correctly complete the statement about the process of mitosis.
Mitosis is a form of ( sexual / asexual ) reproduction that produces daughter cells with genetic information that is ( identical to / modified by / different from ) the parent cell.
Part B: A model of mitosis is shown beginning with the prophase stage. Record the letter of a cell stage in each circle to correctly complete the model of mitosis. Some cell stages may be used more than once and some may not be used at all.
Part A : asexual, identical to
Part B: YVWZZ