The Hayflick limit describes ____
a. the size limit to which a cell can grow
b. the number of divisions a cultured cell can undergo
c. the largest number of chromosomes an organism can possess
d. the most cells an organism can have
e. how rapidly DNA replication can occur
ANSWER: b
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The activation of helper T cells is likely _____
A) when an antigen is displayed by a dendritic cell B) when a cytotoxic T cell releases cytokines C) when natural killer cells come in contact with a tumor cell D) in the bone marrow during the self-tolerance test E) when B cells respond to T-independent antigens
Sexual reproduction uses __________ to generate _______ gametes, which join at fertilization
A) meiosis; haploid B) mitosis; haploid C) meiosis; diploid D) mitosis; diploid E) mitosis; identical
Biological rhythms in animals isolated from light and dark cues _____
A) continue to have cycles of exactly twenty-four hours' duration B) continue to have cycles of approximately twenty-four hours duration; some more rapid, some slower C) synchronize activity with whatever lighting cycle is imposed on them D) cease having any rhythms
Which of the following is not true concerning the cellular compartmentation of the steps of respiration or fermentation?
A) Acetyl CoA is produced only in the mitochondria. B) Lactate is produced only in the cytosol. C) NADH is produced only in the mitochondria. D) FADH2 is produced only in the mitochondria. E) ATP is produced in the cytosol and the mitochondria.