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jonny [76]
3 years ago
9

A membrane that only "lets" certain molecules in while keeping other molecules out is ___ ___.

Biology
2 answers:
Zanzabum3 years ago
8 0
It is selectively permeable
Helga [31]3 years ago
5 0

Answer: selectively permeable

Explanation:

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Seismographs rely heavily on a pendulum (free-swinging weight) to record measurements. How do you think using a pendulum helps d
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Generally, a seismograph consists of a mass attached to a fixed base. During an earthquake, the base moves and the mass does not. The motion of the base with respect to the mass is commonly transformed into an electrical voltage. The electrical voltage is recorded on paper, magnetic tape, or another recording medium.

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2 years ago
The gene D controls wing shape in flies and has two alleles: D is wild-type and dominant, and d is recessive and causes flies to
borishaifa [10]

Answer:

10% of progeny would have wild type phenotype

Explanation:

True breeding fly with wild type wings and small eyes: De/De

True breeding fly with downward wings and wild type eyes: dE/dE

Cross between them :  De/De X dE/dE = De/dE ( F1 )

Recombination frequency = 20%

Next cross, De/dE X de/de =

De/de = parental = 40%

dE/de = parental = 40%

DE/de = recombinant = 10%

de/de = recombinant = 10%

The third genotype i.e. one of the recombinant genotypes will have the wild type makeup ( DE/de ) hence 10% of flies would have wild type phenotype.

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2 years ago
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An arrangement of genes consisting of an operator, a promoter, and a repressor is an OPERON.

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Which does the work of the immune system?
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Describe the main characteristics of chordates.<br> Please DESCRIBE! <br> thanks
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Hope this helps

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