A stamen is:
a. composed of a stigma and a style
b. the mature male gametophyte
c. composed of an anther and a filament
d. part of the vegetative phase of an angiosperm
e. part of a plant growth shoot
c
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Chloroplasts are composed of membranous sacs called ________ that carry chlorophyll. Surrounding these sacs is a ground substance called ________.
A. grana; stroma B. cristae; stroma C. thylakoid; matrix D. cristae; matrix E. thylakoids; stroma
Why is eukaryotic DNA underwound even though eukaryotes lack topoisomerases that can introduce supercoils?
What will be an ideal response?
A substance that cannot be broken down into simpler substances by ordinary chemical or physical
techniques is a(n) ____.
a. molecule b. chemical c. compound d. element e. biological compound
Outbreaks of ____ in humans typically arise when a person comes in contact with an infected animal
a. HIV b. swine flu c. bird flu d. Ebola e. herpes