Microscopic examination of cerebrospinal fluid reveals gram-positive rods. What is the organism?
A) Haemophilus
B) Listeria
C) Naegleria
D) Neisseria
E) Streptococcus
B
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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.
A light microscope with an objective lens numerical aperture of 0.65 is capable of allowing two objects 400 nm apart to be distinguished when using light with a wavelength of 420 nm.
Answer the following statement true (T) or false (F)
X inactivation can lead to ____________________ in females who are heterozygous for X-linked genes. Fill in the blank(s) with the appropriate word(s)
The single strand of mRNA that is produced during transcription has the same polarity as the ________ strand of DNA
A) template B) nontemplate C) leading D) lagging E) nonsense