In mosses gametes are produced by _____; in ferns gametes are produced by _____.
a) mitosis ... mitosis
b) meiosis ... mitosis
c) binary fission ... mitosis
d) mitosis ... meiosis
e) meiosis ... meiosis
Answer: a) mitosis ... mitosis
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Why are sex chromosome aneuploidies less detrimental than autosomal aneuploidies?
A. Sex chromosomes do not contain genes that are important for anything other than sex determination. B. In females, all but one X-chromosome is inactivated; in males, the Y chromosome contains very few genes, so extra or missing copies do not cause huge abnormalities. C. Gene expression of the sex chromosomes is not dosage-dependent as it is for the autosomes. D. Sex chromosomes are only found in gametes, they do not occur in diploid cells. E. All of these are TRUE.
The event that occurs when allolactose levels increase in E. coli is
A. the tryptophan operon becomes more active. B. transcription of genes within the lac operon decreases. C. E. coli cells replicate rapidly. D. transcription of genes within the lac operon increases. E. transcription of genes within the lac operon does not change.
The antimicrobial susceptibility of a bacterium can be determined by
a. the disk diffusion test. b. the tube dilution technique. c. determining the minimum inhibitory concentration. d. all of the above.
The passive movement of a solute from a point of high concentration to a point of low concentration is known as:
A. diffusion. B. active transport. C. endocytosis. D. solubility.