bio unit test 3

For this question assume that no start codons or stop codons are added or changed. If a DNA molecule for a gene is mutated by a point mutation that is a single nucleotide substitution, then in the protein exactly one amino acid will be different. the protein will be longer. up to one amino acid will be different. the protein will not change. two or more amino acids will be different.

up to one amino acid will be different.

Normally, eukaryotic cells divide to repair wounds. add more cells during growth of an child. All of the other answers are correct. replace dead cells. add more cells during growth of an infant.

All of the other answers are correct.

The enzyme that adds more complementary DNA nucleotides to the 3' end of a DNA strand is helicase DNA polymerase RNA polymerase DNA binding protein primase

DNA Polymerase

During the mitotic cell cycle membranes do not change because they are needed for the structure of the cell. the cytoskeleton moves the even chromosomes into the daughter cells, and keeps the odd chromosomes in the parent cell. the cytoskeleton does not change because it is needed for the cell structure. DNA is duplicated and separated into new cells

DNA is duplicated and separated into new cells.

Sister chromatids are made during. G1 phase of the mitotic and meiotic cell cycles. anaphase of mitosis and meiosis. telophase the mitosis, but not of meiosis. S phase of the mitotic and meiotic cell cycles. G2 phase of the meiotic cell cycle, but not the mitotic cell cycle.

S phase of the mitotic and meiotic cell cycles.

Which of the following happens LAST during the mitotic cell cycle? Microtubules emerge from the centrosomes. The cleavage furrow forms. Sister chromatids align on the metaphase plate. The spindles start to pull on the kinetochores of sister chromatids. The sister chromatids separate.

The cleavage furrow forms.

Of the events below, which would happen LAST in the mitotic cell cycle after the DNA was replicated? The sister chromatids would separate. The nuclear envelop would break apart. The chromosomes would align on the metaphase plate. The mitotic spindle would start to form. The plasma membrane would form a cleavage furrow and would divide the cell into two daughter cells.

The plasma membrane would form a cleavage furrow and would divide the cell into two daughter cells.

A single circular chromosome is found in the nucleoid, not a nucleus, in a single-celled yeast, which is a eukaryote. an animal cell. a prokaryotic E. coli cell. a eukaryotic plant cell. human cells.

a prokaryotic E. coli cell

When DNA is replicated, the new strand (new nucleic acid polymer) is made by adding new bases to the 3' end of the new nucleic acid polymer. making peptide bonds between the new bases and the new nucleic acid polymer. adding new bases to the nitrogenous bases on the new nucleic acid polymer with covalent bonds. adding new bases in the middle of the new nucleic acid polymer. adding new bases to the 5' end of the new nucleic acid polymer

adding new bases to the 3' end of the new nucleic acid polymer.

The cytoskeleton plays a big role in the mitotic cell cycle. Actin microfilaments are used in the mitotic cell cycle for transcription. dividing the cell in two during cytokinesis. translation. pulling the sister chromatids apart. replicating the DNA.

dividing the cell in two during cytokinesis.

When in the life cycle do cells go from being haploid to being diploid? during fertilization when gametes are made in the gonads during the meiotic cell cycle during the mitotic cell cycle during growth and development of the muscles and skeleton

during fertilization

Assuming there are no mutations, sister chromatids remain connected at the centromere at the end of cytokinesis. have the same genes, but the genes are in a different order in each sister chromatid. do not exist. have complementary DNA sequences to each other. have identical DNA sequences to each other.

have identical DNA sequences to each other.

Sister chromatids have different lengths. have the same genes. have different alleles. have centromeres in different locations. have the same genes, but in different orders from each other.

have the same genes

Sister chromatids have different genes. have the same lengths. have the same genes, but in different orders from each other. have different alleles. have centromeres in different locations.

have the same length

A pair of sister chromatids is made when one DNA double helix is copied during S phase. is made during anaphase. includes four double helices of DNA which are made during interphase. is made when the tetrads form in prophase I of meiosis

is made when one DNA double helix is copied during S phase.

There is exactly one double helix of DNA in a pair of sister chromatids. the human genome (all of the chromosomes of one human) the nucleus of a typical eukaryote. one duplicated chromosome. one non-duplicated chromosom

one non-duplicated chromosome

What is a consequence of mutations in DNA? proteins and phenotypes may be different. the individual with a mutation will die. there are no consequences because proteins, not DNA matter. the cell with a mutation will die. the individual with a mutation will have cancer.

proteins and phenotypes may be different.

The microtubules have to connect to the centromeres before metaphase because the microtubules proofread the DNA to check for and repair any errors in DNA replication. pull the chromosomes to the center of the cell. stop transcription. are the part of the cytoskeleton that separates the cell in two during cytokinesis.

pull the chromosomes to the center of the cell.

The new nuclear envelopes are forming around the daughter chromosomes at opposite poles of a cell in mitosis. This cell is in

telophase

Homologous chromosomes come from mitosis. binary fission. the two parents at fertilization.

the two parents at fertilization.