Giant salvinia is a floating fern native to Brazil introduced to Texas as an aquarium plant and is now found in large bodies of water across the state. The invasive plant may be carried to new bodies of water by fishing and recreational boats. It grows quickly, covering large areas of the water's surface. When the plant dies and decomposes, the oxygen content in the water declines. Which statement best describes how giant salvinia affects a Texas ecosystem?
4 points
4
Question 2
2.
The sodium-potassium pump is a type of __________ that moves sodium (Na⁺) and potassium (K⁺) ions against their concentration gradients across the __________. This process requires energy in the form of __________because the ions are being transported from areas of low concentration to areas of high concentration, which does not happen naturally.
Active transport is necessary for maintaining __________, which means keeping a stable internal environment. Unlike passive transport, which moves substances naturally from high to low concentration, active transport requires energy input to push substances in the opposite direction. This process is essential for keeping cells alive and functioning, making it an important example of how cells maintain balance in the body.
Required
1 point
1
Question 3
3.
A scientist examined two populations of the grasshopper species Atractomorpha lata. The scientist found that the population raised in higher temperatures had a higher frequency of brown coloration, while the population raised in lower temperatures had a higher frequency of green coloration.
Based on this information, which biological process is affected by temperature in A. lata?
Required
1 point
1
Question 4
4.
A student observed a human cheek cell under a light microscope and made these observations:
The chromatin is condensed
There is no visible nucleolus
The spindle fibers are visible
The nuclear membrane looks like it is disappearing
What phase of the cell cycle is this student MOST LIKELY observing?
1 point
1
Question 5
5.
Cystic Fibrosis is an autosomal recessive disorder in humans. What is the probability that an offspring will have cystic fibrosis if both parents are carriers of cystic fibrosis? Answer with the correct percentage using the number only.
1 point
1
Question 6
6.
Identify the components of DNA. Move the correct answer to each box. Not all answers will be used.
Other Answer Choices:
base pair
ribose sugar
nucleotide
phosphate
deoxyribose sugar
nitrogenous base
Required
1 point
1
Question 7
7.
The bar graph shows the average beak depth (distance from the top of the beak to the bottom) of a population of finches. The data were collected in 1976 and in 1978, after a drought occurred in 1977 in the area.
Which factor best describes the change is this population of finches?
