Which of these items associated with DNA packaging is the thickest?
a. a DNA double helix
b. a solenoid
c. a nucleosome
d. an H2A histone protein
e. an H1 histone protein
B
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Which type of connective tissue forms tendons and ligaments?
a. loose connective tissue b. blood c. cartilage d. fibrous connective tissue e. adipose tissue
A recessive allele on the X chromosome causes color deficiency. A color-deficient boy has a mother with normal vision and a color-deficient father. From which parent did he get the color-deficiency gene?
A) Mother B) Father C) Either mother or father
A child may be given the vaccine for chickenpox. If the child goes to school and plays with other children who have the chickenpox virus, the vaccinated child will not get sick. Why is this?
A) Vaccines introduce a friendly virus into cells so they cannot be infected with a second virus. B) Vaccines stimulate macrophages to work extra hard to fight infections. C) Vaccines produce a primary response in which memory cells are generated that respond rapidly in a second exposure. D) Vaccines act like antibiotics so that any organism in the body will be destroyed before the immune system has to respond.
During crossing over, _____.
A) corresponding portions of genetic material are switched between homologous chromosomes B) beneficial combinations of genes are passed intact from parent to gamete C) the better, dominant genes are recombined prior to gamete formation D) all of the choices characterize crossing over