The cellular components of blood that transport oxygen are
A. leukocytes.
B. erythrocytes.
C. platelets.
D. chondrocytes.
E. osteocytes.
B. erythrocytes.
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Which of the following is true for ALL exergonic reactions?
A. The products have more total energy than the reactants. B. The reaction proceeds with a net release of free energy. C. Some reactants will be converted to products. D. A net input of energy from the surroundings is required for the reactions to proceed. E. The reactions are nonspontaneous.
If you remove the peptidoglycan layer from a Gram-positive cell, it would still stain purple with a Gram stain.
Answer the following statement true (T) or false (F)
A pine tree is
a. a sporophyte. b. a gametophyte. c. diploid. d. both a and c.
Swine are vulnerable to infection by bird flu virus and human flu virus, which can both be present in an individual pig at the same time. When this occurs, it is possible for genes from bird flu virus and human flu virus to be combined
If the human flu virus contributes a gene for Tamiflu resistance (Tamiflu is an antiviral drug) to the new virus, and if the new virus is introduced to an environment lacking Tamiflu, then what is most likely to occur? A) The new virus will maintain its Tamiflu-resistance gene, in case of future exposure to Tamiflu. B) The Tamiflu-resistance gene will undergo mutations that convert it into a gene that has a useful function in this environment. C) If the Tamiflu-resistance gene involves a cost, it will experience directional selection leading to reduction in its frequency. D) If the Tamiflu-resistance gene confers no benefit in the current environment, and has no cost, the virus will increase in frequency.