Q: There are only four possible bases that make up each dna nucleotide: adenine, guanine, thymine, and? Choices: - taurine - phenylalanine - guarine - cytosine A:
cytosine

Q: Internal and external forms of what life process occur as simple diffusion due to a partial pressure gradient? Choices: - reproduction - metabolism - photosynthesis - respiration A:
respiration

Q: Q: What is the liquid component in blood? Choices: - respiration - aqueous humor - hemoglobin - plasma A:
A: plasma

Question: Q: What is produced when haploid gametes fuse in sexual reproduction? Choices: - deformity - cell cluster - isolated zygote - diploid zygote A:
Answer: diploid zygote

*Question*
Q: Behind the pupil, a single lens focuses light on a layer of what? Choices: - photons - chloroplasts - electrons - photoreceptors A:
**Answer**
photoreceptors

(Question)
Q: Echinoderms are found in many different ocean environments, but most are found where? Choices: - in tidepools - in beaches - in waterfalls - in reefs A:
(Answer)
in reefs