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kkurt [141]
2 years ago
10

Which of the following describes a properly controlled experiment?

Biology
2 answers:
Arte-miy333 [17]2 years ago
7 0
<span>D. Five radish plants are grown in sunlight, while another five radish plants are kept in the dark.</span><span> 

Scientific method is a process that is ongoing. Based on the observations via properly done experiments, a scientist can come to a proper conclusion. Although the procedures followed during experiment may vary, but the final result should always be the same</span>
netineya [11]2 years ago
3 0

Answer:

Option D, Five radish plants are grown in sunlight, while another five radish plants are kept in the dark.

Explanation:

In a controlled experiment, impact of one independent variable is studied on the dependent variable.  

Here in this study sunlight is the independent variable while the radish plant is dependent variable.  

The researcher wants to study the effect of sunlight on radish plants when they are exposed to it   and compare it to the effect created on radish plants  that are kept in dark.  

Hence option D is correct.

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Please also describe how actin-binding sites are made available for cross-bridging with myosin heads during contraction.
yaroslaw [1]

Answer: The calcium ion binds to troponin, and this slides the tropomyosin rods away from the binding sites.

Explanation:

Contraction and relaxation of muscle cells brings about movements of the body. The contractile myofilament called sarcomeres are bounded at each end by a dense stripe called the Z - line, to which the myosin fibres are attached, and lying in the middle of the sarcomere are the actin filaments, overlapping with the myosin.

When action potential spreads from the nerve along the sarcolemma (muscle cell membrane), it penetrates deep into the muscle cell through the sarcoplasm (cytoplasm of muscle cell), and releases CALCIUM from the intracellular stores.CALCIUM triggers the binding of myosin to the actin filament next to it forming CROSS BRIDGES.

For this to occur, ACTIN BINDING SITE has to be made available. TROPOMYOSIN is a protein that winds around the chains of the actin filament and covers the myosin-binding sites to prevent actin from binding to myosin. The first step in the process of contraction is for calcium ions to bind to troponin so that tropomyosin can slide away from the binding sites on the actin strands.

3 0
3 years ago
if you want to conduct a research study about your favorite restaurant in town,what method of qualitative research is appropriat
iogann1982 [59]

Answer:

People that like the restaurant

Explanation:

In order to judge the feeling of the town, you should take into aspect what other people think of it, and since the people's numbers change, it would be good use to measure some aspects

7 0
3 years ago
In humans, a type of blindness is due to a dominant allele; normal vision is the result of a recessive allele. Migraine headache
yan [13]

Answer:

Yes.

Probability of such child = 1/2 or 50%

Explanation:

According to the question, below are the genotypes and phenotypes possibilities:

aa = normal vision & no headache

Aa = normal vision & no headache

AA = blindness & headache

                                                                      Male                       Female

                                                                        Aa                            aa

Possible genotypes of progeny:            Aa        Aa           aa         aa

So it is clear that out of the 4 probable children, 2 with 'genotype aa' will have normal vision & no headache.

Mathematical expression is as under:

2/4 = 1/2 that means 50% progeny.

5 0
3 years ago
What are the male and female parts of a flower?
Dmitry [639]

Answer:

the male part of a flower is called the stamen, it consists of a long slender stalk, the filament, with a two-lobed anther at the tip.

the female part of a flower is called the pistil, it consists of the stigma, the style, the overy and the ovule.

5 0
3 years ago
What is incomplete dominance?
Tresset [83]
The appropriate answer is D ! in this the dominant allele is not fully dominant ! this is seen in Snapdragon !

so answer is D
7 0
3 years ago
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