How can Cytophaga and Flexibacter be distinguished in the laboratory?
a. by observing for gliding motility
b. by comparing growth rate in acetate
c. by scoring for growth on cellulose
d. all of the above
Answer: C
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The endosperm of a plant ____
a. is the food supply for the new sporophyte plant b. is composed of haploid tissue c. protects the young embryo within a seed d. provides a connection between the ovary of a flower and a developing seed e. produces sperm cells
The dots in the figure represent a(n)
a. covalent bond. b. ionic bond. c. hydrogen bond. d. polar covalent bond. e. hydrophobic interaction
The kinetochore holds the homologous chromosomes together.
Answer the following statement true (T) or false (F)
Hemophilia is a sex-linked recessive condition that results in deficient blood clotting. The disease causes excessive bleeding which occurs spontaneously or upon slight injury. In dogs (as in humans) hemophilia is caused by a defect in a gene on the X chromosome. What will be the results of mating between a normal, noncarrier female dog and a male dog with hemophilia?
A. Half the male offspring will be normal and half will have hemophilia; all females will be carriers. B. All the female offspring will be normal and all male offspring will be carriers. C. All of the offspring will be normal, but all females will be carriers. D. All female offspring will be normal and half the male offspring will have hemophilia. E. Half the female offspring will have hemophilia and half will be carriers, all male offspring will be normal.