Structure
rRNA is responsible for carrying amino acids to the ribosome.
True or False
False
This is the job of tRNA
The process of forming RNA from DNA is called translation.
True or Flase
False
It is called transcription.
Cells spend most of their lives in the mitosis phase of the cell cycle.
True or False
False
Cells spend most of their time in interphase
Some organisms can use mitosis for reproducing.
True or False
True
The cytoplasm is divided and two new cells are formed.
Cytokinesis
The shape of a DNA molecule was described as?
Double Helix
What base forms a base pair with guanine in DNA?
Cytosine
What is the first step in replication?
Enzymes unzip the DNA strand into two havles
Meiosis reduced the 2n number of genes down to _____
n
The chromosomes are lined up at the center of the cell.
Metaphase
Which RNA is produced during transcription?
mRNA (messenger RNA)
A gene is a section of a DNA molecule that codes for a unique _____________.
Protein
Mitosis results in offspring that are ____________ to the parent.
identical
Meiosis involves __________ cell divisions that result in haploid daughter cells.
two
Sister chromatids divide into separate chromosomes and are moving to opposite sides.
Anaphase
Which of the following is not a part of a nucleotide?
a base
a gene
a phosphate
a sugar
A gene
Codons code for about twenty different ___________ that are used to build proteins.
Amino Acids
Matching pairs of chromosomes in a diploid cell are called?
homologous chromosomes
Gametes combine together to produce a ____________
zygote
New chromosomes reach opposite ends of the cell and uncoil.
Telophase
What is the difference between haploid and diploid cells?
Haploid cells have one set of genes.
Diploid cells have two complete sets of genes.
Give at least two ways that an RNA molecule is different from a DNA molecule.
1. single strand vs. double
2. the sugar ribose and deoxyribose
3. uracil vs. thymine.
The body cell of a rabbit contains 44 chromosomes. If the cell underwent mitosis and cytokinesis, how many chromosomes would each newly formed cell have?
44
The sperm and eggs cells for mice each have 20 chromosomes. How many chromosomes do the diploid zygotes formed have?
40 chromosomes
The nuclear membrane disappears and the chromatin begins to coil up.
Prophase