17. In DNA, what base always pairs up with thymine? c. uracil d. guanine a. adenine b. cytosine 18. Which of the following functions do nucleotides not perform in cells? a. serve as building blocks of nucleic acids b. regulate cellular activity c. form structural components of membranes d. are sources of chemical energy 19. Which of the following statements best describes the relationship between an enzyme and a substrate? a. An enzyme is like a lock that fits a particular key, which is the substrate. b. An enzyme and a substrate form a permanent enzyme-substrate complex. c. An enzyme converts the substrate into a product and then breaks down. d. An enzyme temporarily changes its conformation so it can better accommodate a substrate.

I want answer of question no 2 to question no 12 Please give me Thank you!

Hello, Can you please help me to answer next question abaut the case? Case: Mr. Hollon is a retired 76-year-old male who spent his entire working career as a fire fighter. He has a 22-year history of type 2 diabetes; he also has hypertension and emphysema. He is an active smoker (52-pack year smoking history), although he has attempted to stop smoking on several occasions. He wears a hearing aid in each ear because of hearing loss as a result of working around machinery for several years. Thinking in sensory perception: List three clinical manifestations that the cues suggest need to have further investigation or assessment. Thank you in advance!

Hi, can you please help me label this?   Thank you

PLEASE ANSWER the questions correlty and please answer all the questions with what it regards in saying exactly, please and thank you take your time. Ive read the guide lines and honor code that i can have up to Submit only one question at a time under the appropriate subject. A question can have up to 3 subparts (i.e. part a, b, and c). If you dont belive me here is the link of barthleby saying exactly that thanks: https://bartleby.zendesk.com/hc/en-us/articles/360017462394-How-can-I-ensure-my-questions-get-answered-as-quickly-as-possible-

Hi there! Would you be able to assist with this question?

Please answer very soon

What is the significance of the slight swelling (called a goiter) in Krista's neck?     View Available Hint(s)for Part C                It is a sign that her thyroid gland is overactive.                  It is unrelated to her condition.                  Her thyroid gland is producing but not secreting excessive amounts of thyroid hormone.                  The auto-antibodies of Graves' disease have caused inflammation of her thyroid gland.          Under normal conditions, increased levels of thyroid hormone in the blood will cause _______.     View Available Hint(s)for Part D                no change in TSH levels                  an increase in thyrotropin releasing hormone (TRH)                  an increase in TSH levels                  a decrease in TSH levels