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3 years ago

Despite the diversity of nature, most organisms contain the same 4 DNA bases.

Biology

1 answer:

klio [65]3 years ago

5 0

Answer:

Adenine, thymine, cytosine, guanine

Explanation:

some things use uracil instead of guanine but its less common. also to remember which ones pair up, remember Apple in the Tree (Adenine pairs with Thymine), and Car in the Garage (Cytosine pairs with Guanine).

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How do you think the plant structure differ between wind- and animal- pollinated plants?

Gnesinka [82]

Answer:

the plant structures are formed by wind

5 0

3 years ago

The _____ is the primary channel for the transportation of water, mineral and food from the roots and leaves to the rest of the

murzikaleks [220]

Answer:

Xylem

Explanation:

Xylem is one of the vascular tissues or conducting tissues in plants. It primary function is to transport water, solutes, minerals, from the plants root and leaves to the rest of the plants. It also provide physical support to the plants and it consist of specialised vessels that contain tissues called tracheary elements.

5 0

3 years ago

A 20-pound object is dropped from a 50-foot bridge onto the ground below it. A 50-pound object is dropped from a 100-foot cliff

ira [324]

The 50 pound object will reach the ground first.

Explanation:

Using the second equation of motion, we can derive the time taken for each of the object to reach the ground. As the object is thrown from the top of the bridge or cliff, acceleration due to gravity will be acting on them.

So, $s = ut+\frac{1}{2} at^{2}$

The value of s for the object thrown from 50 foot bridge is given as 50 ft. The initial velocity of the object will be zero. The acceleration can be written as the ratio of mass to gravitational force.

Then, $s = (0) t +\frac{1}{2}*\frac{m}{F}*t^{2}$

$50 = \frac{20}{2F} t^{2} \\\\t^{2} = \frac{100F}{20}$

$t = \sqrt{5F}$

Then, consider the time taken for the 50 pound object to reach the bottom of 100 ft cliff as t₁ and the displacement in this case is 100 ft.

Then, $100 = (0)t +\frac{1}{2}*\frac{50}{F}*t_{1}^{2} \\\\t_{1}^{2} =\frac{200F}{50}$

$t_{1} = 2 \sqrt{F}$

Since, the gravitational force acting on both the objects will be same, the ratio of time taken is

$\frac{t }{t_{1} }=\frac{\sqrt{5F} }{2\sqrt{F}} = \frac{\sqrt{5} }{2}$

So, the time taken for the 20 pound object to reach the ground of 50 ft bridge is √5 s =2.236 s and the time taken for the 50 pound object to reach the ground of 100 ft cliff is 2 s.

Thus, the 50 pound object will reach the ground first.

5 0

3 years ago

What is a food web? how does it work?

Wittaler [7]

A food wed is about who eat who like for example I think the human are on the top of the food chain because no one eat him

4 0

3 years ago

Read 2 more answers

Place the following events that occur at the vertebrate neuromuscular junction in the correct order. I Depolarization of the mus

meriva

Answer:

Generation of an action potential in the neuron.

Stimulation of Ca2+ entry into the neuron

Release of acetylcholine into the synapse

Depolarization of the muscle fiber membrane

Explanation:

The following events takes place in the vertebrate neuromuscular junction

a) Nerve Action Potential - Action potential reaches the axon terminal

b) Entry of calcium ion - The calcium ion reaches the axon terminal and enter into the presynaptic terminus after which the Synaptic vesicles fuse with the membrane of axon terminal

c) Releasing of Arch Quanta - Acetylcholine is released into synaptic cleft which then binds to the receptor sites on motor end plate

d) The Na+/K+ channels opens and Motor end plate becomes depolarized.

3 0

3 years ago