1. Natural selection can be best defined as:
A. survival of the best adapted individuals.
B. nonrandom reproduction.
C. differential population growth rates.
D. enhanced survival of those individuals best adapted to attract mates.
E. the elimination of the weak by the strong.
(I chose E, I am not sure correct or not)
2. Which one of the following concepts which are related to evolution and adaptation is not correct?
A. Genetic shift has more evolutionary impact on small population than on large ones.
B. Many genes are simultaneously subject to both positive and negative selection pressures.
C. Polymorphism is the occurrence in a population of two or more distinct forms of a genetically determined character.
D. For evolution to occur in a population, reproduction must be totally random.
E. Mutations are less significant for evolutionary change than recombination of existing alleles.
(This question i have no idea)
3. Which one of the following groups of bacteria belongs to Kingdom Archaebacteria?
A. prochlorophytes
B. cyanobacteria
C. eubacteria
D. green photosynthetic bacteria
E. methanogens
(I chose E, I am not sure correct or not)
4. Which of the following statement concerning viruses is false?
A. Viruses have no metabolic machinery of their own.
B. Viral genes are composed only of DNA.
C. Viruses cannot be cultured on certain conditions.
D. Viruses will form crystals under certain conditions.
E. Viruses are infectious particles composed of nucleic acid and protein coats.
( I chose B, I am not sure correct or not)
5. The food plants Brassica chinensis and Brassica olercea are regarded as genetically isolated gene pools. This means that they belong to:
A. different populations
B. different genus
C. different demes
D. the same species
E different species
( I chose E, I am not sure correct or not)
6. A flower of six petals, three sepals, nine stamens, three ovules, and one ovary. How many seeds will this flower produce?
A. 1
B. 3
C. 6
D. 9
E. 27
( I have no idea)
7. In plants, the gametophyte generation is produced by:
A. fertilization of an egg cell by a sperm cell.
B. the formation of four gametes by meiosis.
C. mitosis of sporophyte cells.
D. haploid spores that divide by mitosis.
E. fusion of male and female sporophyte cells.
8. In plants, the gametophyte generation is produced by:
A. fertilization of an egg cell by a sperm cell.
B. the formation of four gametes by meiosis.
C. mitosis of sporophyte cells.
D. haploid spores that divide by mitosis.
E. fusion of male and female sporophyte cells.
( I have no idea)
(Please help, thx)
biology questions ,please help?
2013-04-13 6:59 pm
回答 (2)
2013-04-13 10:18 pm
✔ 最佳答案
i will answer the less obvious ones, only1. E would be wrong because it's not 'enhanced'...A
2. E
3. E, mutations are incredibly important, more so than recombination
4. B, viruses can be DNA or RNA
7. a, c and e are out because a gametophyte is haploid, "Spores are actually the first cells of the gametophyte generation. These spores undergo the process of mitosis, by which identical cells with same number of chromosomes are formed. Male and female gametes with equal 'n' number of chromosomes are formed. When these gametes meet, they fuse together, get fertilized and form the zygote, which is diploid (2n)."...D
2016-11-05 8:44 pm
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