LABS
State one laboratory procedure that would be used to make the organelles of onion cells on a wet mount slide more visible for viewing with a compound light microscope.
— add stain to the slide
— adjust the light
— adjust the focus
— clean the lenses
Homeostasis in single-celled organisms is maintained through the proper functioning of
(1) organelles (3) guard cells (2) estrogen (4) antibodies
(1) organelles
Which interaction is an example of competition between two species?
(1) mice and chipmunks eating sunflower seeds at a bird feeder (2) mold growing on a tree that has fallen in the forest (3) a coyote feeding on the remains of a squirrel killed on the road (4) a lion stalking, killing, and eating a zebra
(1) mice and chipmunks eating sunflower seeds at a bird feeder
The differing rates of migration of DNA fragments in a gel electrophoresis procedure is mainly due to
(1) the volume of the DNA sample used (2) the size of the DNA fragments produced (3) the number of DNA fragments in the gel (4) the size of the wells of the gel
(2) the size of the DNA fragments produced
In humans, two organ systems work together to move oxygen throughout the body and deliver it to cells. Which system directly delivers oxygen to body cells?
(1) nervous (3) respiratory (2) digestive (4) circulatory
(4) circulatory
Test anxiety and stress can trigger many responses in the human body. It can stimulate increased heart and respiratory rates and increased sweating. These physical responses to increased stress are examples of
(1) competition (2) infections (3) gene manipulation (4) feedback mechanisms
(4) feedback mechanisms
Which part of the Beaks of Finches lab activity was changed in order to simulate the different conditions on various islands?
(1) type of beak (2) size of beak (3) type of seeds present (4) size of stomach container
(3) type of seeds present
Most scientists agree that a large asteroid struck Earth around 65 million years ago. The impact sent large amounts of fine dust particles into the atmosphere, which reduced the amount of sunlight reaching the planet. This event would have the most immediate effect on
(1) herbivores (3) carnivores (2) decomposers (4) autotrophs
(4) autotrophs
Which set of substances are molecular building blocks that directly form some of the complex organic molecules present in humans?
(1) water and oxygen (2) starch and nitrogen (3) carbon dioxide and proteins (4) glucose and amino acids
(4) glucose and amino acids
8 A sequence of mRNA bases that can produce a certain protein was found to be: UUU GGG CCC AUA Write the sequence of DNA that would produce this sequence of mRNA bases.
AAA CCC GGG TAT
The structures most directly involved in the synthesis of cellular proteins are the
(1) nucleus and ribosomes (2) cell membrane and nucleus (3) chloroplasts and cell membrane (4) mitochondria and chloroplasts
(1) nucleus and ribosomes
Damage to which structure would directly interfere with the nutritional needs of a developing embryo?
(1) ovary (3) lungs (2) testes (4) placenta
(4) placenta
Five students measured their pulse rates, then exercised by running up and down the stairs five times, then measured their pulse rates again. In the investigation, the independent variable is the
(1) time to run up and down the stairs (2) pulse rate (3) five students who participated (4) exercise that was done
(4) exercise that was done
Potato plants reproduce both sexually and asexually. Depending on the desired outcome, potato growers use both types of reproduction. A grower would most likely want the potato plants to reproduce asexually when
(1) selectively breeding new potato varieties (2) there is a disease affecting similar potatoes growing in the area (3) environmental conditions in the area are changing (4) potatoes with the same traits are desired
(4) potatoes with the same traits are desired
Which statement correctly describes an organism’s genetic information?
(1) DNA molecules contain four subunits known as genes. (2) Chromosomes are made entirely of protein. (3) Genes are made of long sequences of chromosomes. (4) DNA contains combinations of four base subunits.
(4) DNA contains combinations of four base subunits.