A boatload of botany questions
I hate to be one of those who takes their homework questions and tries to pawn them off on this website, but a number of these questions are NOT clearly explained in my textbook. It's very frustrating. So, I'm going to try here. There are a lot, on several different subjects, some pertaining to biology or chemistry in general and not necessarily just botany. Any help would be GREATLY appreciatied.
They are multiple choice. Here we go....
1. What must occur in binary fission before the cell can divide (my money's on B or D)?
a: The chromosomes must be replicated
b. The chromosome must be replicated
c. The nucleus must be replicated
d: The septum must form
2. If one species has a higher chromosome number than another species, must it also have more genes (my money's on D)?
a. Yes, because genes are roughly the same length
b. Yes, even though the chromosomes can be different lengths
c. No, since genes can be very different lengths
d. No, because the chromosomes are different lengths
3. After the DNA is replicated during the S phase of interphase, why doesn't the cell simply enter mitosis?
a. Genes necessary for division must first be synthesized
b. Proteins and other structural components must still be synthesized before division occurs
c. The chromosomes must also be replicated in the G2 phase
d. It does; the S phase is the last phase of interphase
4. Since there are 20 different aminoa acids, and tRNA is the molecules that brings an amino acid to the ribosome during translation, why are there over 60 different tRNA molecules instead of just 20?
a. The 3 types of ribosomes in the cells (in organells, on rough ER, free in the cytoplasm) each have their own set of tRNA molecules
b. The extra tRNA molecules are coded for by introns
c. Amino acids can undergo conformational changes, and several tRNA moleucles code for different conformations on the same amino acid
d. None of the above
5. Why are prokaryote genomes so much smaller than eukaryote genomres?
a. Prokaryotes lack introns
b. Prokaryotes lack exons
c. Prokaryotes are smaller, so they have fewer genes
d. Prokaryotes are much simpler than eukaryotes, and lack the specialization for which large numbers of genes would be required
6. Which of the following is a true statement (it seems a and d are both correct!)?
a. Prokaryotes lack sexual reproduction
b. Prokaryotes readily undergo meiosis
c. Prokaryote gametes fuse to form zygotes
d. Prokaryotes have a means of genetic exchange
7. If you treated an organism a chemical that inhibited microtubule formation in the cells that form gametes, after three generations what would the offspring's chromosome number be (my money's on c)?
8. Which of the following is a true statement?
a. Meiosis works by separating pairs of homologous chromosomes
b. Since the ovum is larger it contributes he greater number of chromosomes
c. During meiosis chromosomes assort so all male derived chromosomes end up in one gamete
d. None of the above
9. You are studying sporangial developement in a fern that has a diploid chromosome number of 30. How could you tell is meiosis has occuring in the sporangium (my money's on a)?
a. There would be four times the number of cells, each having 15 chromosomes
b. There would be twice the number of cells, each having 30 chromsomes
c. There would be the same number of cells, each having 30 chromosomes
d. There would be twice the number of cells, each having 15 chromosomes
- Humans and most other animals have which type of life cycle?
- In organisms with a zygotic life cycle, crossing over would occur in
a. The hyphae
b. The spores
c. The gametes
d. The zygote
- Why are arginine and glycine considered to be nonessential amino acids?
a. Vitamin supplements contain adequate amounts of these compounds
b. They are plentiful in our diet
c. They are nore needed for proper cell function
d. Our bodies can produce them from other amino acids
- You are working for a nutriecutical company and have found a new plant secondary compound in an extract from a rain forest plant. THe chemical composition of the compound is C8H8O3. You conclue that
a. The compound is a terpene because it contains oxyten
b. The compound cannot be a flavonoid because it has an even number of carbon atoms
c. The compound cannot be an alkaloid because it contains no nitrogen
d. The compound cannot be a phenolic because phenolics lack hydrogen
I KNOW this is a lot, but if you could try and answer most of them, I would be really, really, really grateful. And if you could please, please please, try and resist giving me links to try and answer certain questions, and just type the answer yourself if you know it? Please?