Among plants known as legumes (beans, peas, alfalfa, clover, for example) the seeds are contained in a fruit that is itself called a legume, better known as a pod
Upon opening such pods, it is commonly observed that some ovules have become mature seeds, whereas other ovules have not. Thus, which of the following statements is (are) true? 1. The flowers that gave rise to such pods were not pollinated. 2. Pollen tubes did not enter all of the ovules in such pods. 3. There was apparently not enough endosperm to distribute to all of the ovules in such pods. 4. The ovules that failed to develop into seeds were derived from sterile floral parts. 5. Fruit can develop, even if all ovules within have not been fertilized. A) 1 only
B) 1 and 5
C) 2 and 5
D) 3 and 5
C
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While the maximum number of electrons required to fill the outermost shell of an atom varies depending on the size of the atom, almost all of the smaller atoms (atomic numbers 2-20) are considered stable, and thus nonreactive, when they contain ________ electron(s) in the outermost shell.
A. 1 B. 8 C. 16 D. 2
If you found a fish floating on the water covered with a white fuzzy material and tiny dark spheres you would suspect that the fish has been infected by a (an)
(a) diatom. (b) euglenoid. (c) water mold. (d) cynanobacterium.
Which is NOT necessary for sympatric speciation?
a. organisms living together in the same location b. a common home range c. geographic barriers d. existing interbreeding population e. reproductively mature individuals
Using retroviral vectors for gene therapy might increase the patient's risk of developing cancer because they might _____
A) introduce proteins from the virus B) not express the genes that were introduced into a patient's cells C) not integrate their recombinant DNA into the patient's genome D) integrate recombinant DNA into the genome in ways that misregulate the expression of genes at or near the site of integration