题目内容
（请给出正确答案）
A.autotrophs.
B.heterotrophs.
C.prototrophs.
D.omnitrophs.
E.auxotrophs.
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更多“Bacterial strains that can produce all the necessary compounds and therefore grow on minimal media a…”相关的问题
A、accord
B、assurance
C、promise
D、conversation
Weekends are not the only time to worry! Newspaper are full of stories about too many school kids going to school by car because t heir parents do not want them to travel alone on a bus or train.This summer there were more frightening stories of teenagers disappearing with questionable friends that they met on the net.All the Media stories help increase parents fears, but is the UK really so dangerous?
Many young people feel that life for their parents was easier.In the 1960s young people played in the streets more and traveled around town without their parents.“At least our parents can keep tabs on us,” says 16-year-old Julia.“So many people have mobile phones now and their parents ring to find out where they are.I use my mobile to get Dad to come to the station when I arrive late.” Mobiles are not just expensive toys; they help keep young people safe.Most significantly, th ey help keep young people safe.Most significantly, they make parents feel better.Only one problem is, though, that some young people have been attacked by thieves who want to steal their mobile phones.
Young people like going out with friends, but t hey now need to learn how to get home safely.Five million young people in the UK between the ages of 9 to 16 use chat rooms to make friends, but they, too, need to be careful and never give their personal details to a stranger.Young people today have mor e opportunities to meet new people and go out at night more than their parents ever did.Now school, television programs and newspapers must help teenagers to enjoy their freedom and to be responsible for their own safety.
6.Some parents are upset about the summer holidays mainly because their children().
A.wander around on bus in the city
B.chat to strangers in Internet chat rooms
C.make questionable friends on the net
D.are taken little care of by teachers
7.For the sake of the safety, many parents send their kids to school ().
A.by car
B.by bus
C.by train
D.by public transport
8.Most significantly, mobile phones ().
A.enable parents keep a close watch on their kids
B.help keep teenagers safe
C.make parents feel less worried
D.protect teenagers from being attacked
9.Teenagers should never give any strangers ().
A.their mobile phone numbers
B.their family address
C.their personal information
D.their parents'names
10.This passage is mainly about ().
A.freedom for teenagers in summer holidays
B.safety for teenagers in summer holidays
C.activities for teenagers in summer holidays
D.troubles for teenagers in summer holidays
A、a loss of an AT base pair from a gene
B、the addition of methyl groups to cytosines in the promoter region of a gene
C、the substitution of an AT base pair by a GC base pair in a gene as a result of a mistake during DNA replication
D、a deletion that simultaneously removes two genes from the genome
E、None of these examples represents epigenetic changes.
A、the plant Linaria vulgaris
B、the deer mouse Peromyscus maniculatus
C、the worm Caenorhabditis elegans
D、the frog Hyla chrysoscelis
E、the chimpanzee Pan troglodytes
A、homozygote for the dominant allele
B、homozygote for the recessive allele
C、heterozygote
D、mutant
E、inbred recessive
A、nonrandom mating
B、natural selection
C、genetic drift
D、Hardy–Weinberg equilibrium
E、genetic variation
A、inheritance pattern of gene alleles
B、mechanism of DNA replication
C、gene expression patterns
D、evolution
E、chemical modification of nucleic acids
A、ribosomes
B、chromatin
C、proteins
D、histones
E、DNA
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