The distribution of mitochondria between the daughter cells during cytokinesis
a. is random.
b. is directed by the mitotic spindle.
c. is directed by the centrioles.
d. results in the mitochondria remaining in the parent cell.
e. occurs only during meiosis.
Ans: a. is random.
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A(n) ____ is a type of chemical bond in which a strong mutual attraction forms between ions of opposite charge
a. hydrogen bond b. nonpolar bond c. polar bond d. covalent bond e. ionic bond
When the ventricles contract blood is pushed out into the artery and the artery stretches because of its elastic layers allowing the blood to continue to flow into the circulatory system while the ventricle is relaxing.
a. true b. false
Recall that in mice the Igf2 gene exhibits genomic imprinting where the maternal allele is silenced by DNA methylation. What is the probability that a mouse pup (male or female) from the son a homozygous dwarf mother (Ifg2- Igf2-) and a heterozygous normal-size father (Igf2 Igf2-) is normal-sized as well?
A. 100% B. 75% C. 50% D. 0% E. 25%
You have a segment of DNA that contains the following sequence:
5?-GGACTAGACAATAGGGACCTAGAGATTCCGAAA-3? 3?-CCTGATCTGTTATCCCTGGATCTCTAAGGCTTT-5? You know that the RNA transcribed from this segment contains the following sequence: 5?-GGACUAGACAAUAGGGACCUAGAGAUUCCGAAA–3? Which of the following choices best describes how transcription occurs? (a) the top strand is the template strand; RNA polymerase moves along this strand from 5? to 3? (b) the top strand is the template strand; RNA polymerase moves along this strand from 3? to 5? (c) the bottom strand is the template strand; RNA polymerase moves along this strand from 5? to 3? (d) the bottom strand is the template strand; RNA polymerase moves along this strand from 3? to 5?