Which of the following cellular structures is characteristic of amoebas?
A) pseudopodia
B) microvilli
C) cilia
D) flagella
Answer: A
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In human development, the blastocyst, which is a hollow sphere of developing cells, implants in the uterine wall approximately 5 to 6 days after fertilization
A. true B. false
Describe two conditions that would make a DNA mutation result in an altered protein
What will be an ideal response?
If an injection to the mouse contains live R strain and heat-killed S strain Streptococcus pneumonia, ____
a. the mouse will live b. the mouse will became fatally ill and live S strain bacteria will be detected in its blood c. the mouse's blood will contain live pathogenic R strain bacteria d. the dead S strain bacteria will transform to live R strain bacteria e. DNA from the live R strain bacteria will revive the dead S strain bacteria
Male mallards have had emerald green head
feathers and wings with metallic blue patches for hundreds of years, whereas female mallards have been drab, brown-feathered ducks. This phenotypic situation suggests that mallards may be an example of a. directional selection. b. polyploidy. c. allopatric speciation. d. disruptive selection. e. sexual selection.