Many plants devote significant resources to growing colorful, fragrant flowers filled with nectar. What does this illustrate the importance of?
A. Outcrossing
B. Nutrient storage in seeds
C. Long-term nutrient storage in perennial plants
D. Chemical signaling among plants
Answer: A
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Match the following items to the correct phrase.
_______1. Bacteria without cell walls. _______2. Acid-fast bacteria. _______3. Curved, Gram-negative bacilli. _______4. Spore-forming bacteria. _______5. Bacteria having complex nutritional requirements. a. Fastidious bacteria b. Mycoplasma spp. c. Clostridium and Bacillus spp. d. Mycobacterium and Nocardia spp. e. Vibrio species
Four of the five features listed below are
characteristic of the majority of animals. Select the exception. a. multicellular b. make their ATP by fermentation c. usually motile at least during part of their life cycle d. usually diploid with sexual reproduction e. heterotrophic
Where does precursor-mRNA (pre-mRNA) typically exist?
a. in both prokaryotes and eukaryotes b. only in prokaryotes c. only in the nucleus of eukaryotes d. only in the cytoplasm of eukaryotes
In which of the following ways are archaea similar to eukaryotic cells?
a. size
b. shape
c. presence of histones
d. DNA polymerases
e. presence of operons