What does the presence of similar genes in very dissimilar organisms imply?
a. the genes were produced by different selection pressures
b. the organisms share a common ancestor
c. the organisms do not share a common ancestor
d. the genes became identical through mutation
Ans: b. the organisms share a common ancestor
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In your garden you decide to plant potatoes. You watch the above-ground development of your plant and decide to categorize the growth into four main stages:
1. The initial development of the stem and leaves (shoot) 2. The development of flowers and general growth of the shoot 3. A vegetative period where not much growth seems to be happening 4. The harvest of your potato crop (digging up the tubers formed near the base of the stem) In stage 2, which is a bigger "sink" for phloem flow? A. development of flowers B. growth of the shoot C. There is insufficient information to answer the question.
Earlobe attachment is an example of ____
a. pleiotropy b. polygenic traits c. codominance d. continuous variation e. multifactorial traits
The light-dependent reactions begin in a grouping of pigment molecules and proteins called a photosystem.
What will be an ideal response?
Which of the following circumstances is/are of concern in an attempt to fulfill Koch's postulates?
a. Infected animals do not show the same symptoms as infected humans. b. The suspected pathogen is present in healthy humans. c. An axenic (or "pure") culture cannot be obtained. d. All of the above are of concern.