Many animals have a skeleton to provide support. What do plants cells depend on for support so that the stems of the plant can remain upright?
A) chloroplasts
B) cell membrane
C) mitochondria
D) cell wall
Ans: D) cell wall
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Which of the following is an example of a phenotype?
a. a cat’s genome b. the color and length of a cat’s fur c. the alleles that a female passes on to her offspring d. the DNA sequence of an allele e. the DNA sequence of an allele and the alleles that a female passes on to her offspring
Choose the letter that best describes the function of this receptor type: Pacinian corpuscle
A. tonic receptors located near the surface of the skin B. pressure sensitive receptors deep in the subcutaneous layer C. receptors on the face and fingertips sensitive to light touch
What is a reason that aneuploidy in sex chromosomes is generally better tolerated than aneuploidy in autosomal chromosomes in humans?
A) In somatic cells, most of the genes on only one X chromosome are transcriptionally active. B) Autosomal aneuploidy leads to heart defects and death in utero. C) Y chromosome duplication results in only minor changes in testosterone levels. D) Sex chromosome aneuploids may occur as the result of fertilization, but extra sex chromosomes are removed from the developing embryo during subsequent mitosis. E) Any change in autosome number results in increased susceptibility to infection.
When cyclin binds Cdk,
a. the cell transitions from G2 to S. b. kinase activation occurs. c. chromosomes condense. d. the cell quickly enters M phase. e. the cell begins apoptosis.