Plasmodial slime molds are described as acellular because they
A) are heterotrophic.
B) have no nuclei.
C) reproduce asexually.
D) have no membranes surrounding their nuclei.
E) lack DNA.
D
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Which occurs last in the stages of infection and recovery?
a. inflammation b. attack by lysozymes in sweat and saliva c. antibody-mediated immune response d. production of mucous e. production of interferon
Some genes encoding proteins that are essential to
the survival of the organism are called highly conserved sequences. Which of the following is an example of one of these proteins? a. cytochrome b b. muscle structural proteins c. carbohydrate hydrolyzing genes d. skin pigmentation e. keratin
George Beadle and Edward Tatum discovered the key step in showing that genes produce ____________________
through the action of proteins. Fill in the blank(s) with the appropriate word(s).
The products of an endocrine gland:a
only affect their own tissues. b. can have a digestive function. c. always stimulate the target tissue. d. generally have to travel to reach the target tissue. e. are not produced by cells in organs, such as the heart.