The innermost layer of the cortex of a plant root is the
A. epidermis.
B. stoma.
C. guard cell.
D. endodermis.
E. petiole.
Ans: D. endodermis.
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Nearly ALL cases of acute listeriosis require hospitalization
Indicate whether the statement is true or false.
The last portion of the excretory system through which urine passes before it is eliminated from the body is the
a. glomerulus. b. ureter. c. urethra. d. bladder. e. rectum.
What percentage of yeast genes have
homologous genes that can be found in humans?
a. 5 b. 10 c. 20 d. 30 e. 40
Which of the following statements regarding the concept of homology is INCORRECT?
a) Homology is an all-or-none relationship. b) Homology is the presence of a similar feature because of convergence. c) Homology can not be observed because we can not actually see the ancestral organism or molecules and trace its descent. d) Sequences that are highly similar are unlikely to arise by chance. e) Homology is always an inference, a conclusion we draw based on observed similarity.