How do bryophytes obtain water and CO2?
A. They obtain CO2 only through stomata
and water through their roots.
B. They obtain water through their stomata
and CO2 through roots.
C. They absorb both CO2 and water directly
from the environment, without passing
through stomata or roots.
D. They have difficulty absorbing water and
CO2 due to their thick, waxy cuticle.
E. They live in moist environments, so they
do not need to absorb water or CO2.
C
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Gas exchange in mammalian lungs occurs in the
a. villi b. anterior air sacs c. posterior air sacs d. bronchioles e. alveoli
A carcinogen is not a mutagen.
Answer the following statement true (T) or false (F)
Glycosylases and lyases are directly involved in
a. recombination-repair b. photoreactivation c. base excision repair d. mismatch repair e. nucleotide excision repair
Which of the following cell envelopes is found in all bacteria?
A. Cell membrane B. Cell wall C. Outer membrane D. All of the above