What is a component of a single nucleotide?
A. A phosphate group
B. A six carbon sugar
C. All five nitrogenous bases
A
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Which of the following is not evidence supporting the Lyon hypothesis of X inactivation?
A. Female mammals that are heterozygous for X-linked traits are phenotypically mosaics. B. A highly condensed structure is consistently observed in female cells, but not in male cells. C. A female cat that is homozygous for coat color cannot produce calico offspring. D. Calico patterns of coat color are never exactly the same. E. A genetically normal male cat can never be calico.
The sea slugs (nudibranchs) may protect themselves by using which method?
a. Their raspy radula may be used as a defense organ to injure potential predators. b. They make and secrete distasteful substances. c. They use camouflage. d. They hide in their shells. e. They use defensive weapons taken from their prey (toxins and nematocysts).
Which of the following helps in chromosomal movement during cell division?
a. chloroplasts b. microtubule c. microfilaments d. peroxisomes e. intermediate filaments
What type of normal human cell contains 22 autosomes and a Y chromosome?
A) egg cell B) somatic cell of a female C) somatic cell of a male D) sperm cell